EP0350157B2 - Composition de revêtement aqueuse - Google Patents
Composition de revêtement aqueuse Download PDFInfo
- Publication number
- EP0350157B2 EP0350157B2 EP89305419A EP89305419A EP0350157B2 EP 0350157 B2 EP0350157 B2 EP 0350157B2 EP 89305419 A EP89305419 A EP 89305419A EP 89305419 A EP89305419 A EP 89305419A EP 0350157 B2 EP0350157 B2 EP 0350157B2
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- EP
- European Patent Office
- Prior art keywords
- aqueous
- polyurethane resin
- coating composition
- monomers
- aqueous polyurethane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
Definitions
- the present invention relates to a novel and useful aqueous coating composition. More particularly, the present invention relates to an aqueous coating composition comprising an aqueous polyurethane resin and an aqueous dispersion of an acrylic copolymer, and an aqueous coating composition obtained by polymerizing radical-polymerizable acrylic monomers in the presence of an aqueous polyurethane resin.
- aqueous coating composition comprising an aqueous polyurethane resin and an aqueous dispersion of an acrylic copolymer, and an aqueous coating composition obtained by polymerizing radical-polymerizable acrylic monomers in the presence of an aqueous polyurethane resin.
- Aqueous dipsersions of acrylic copolymers as an aqueous coating composition have conventionally been used, for their excellency in weather resistance and toughness, in various applications such as interior or exterior finish work of buildings, coating of leather, metal, wood floor, etc., impregnation or bonding of fibers, adhesion, pasting and the like.
- aqueous polyurethane resins as an aqueous coating composition have conventionally been used, for their excellency in elasticity and abrasion resistance, for the coating of fabric, paper, leather, plastic, wooden floor, etc.
- the resulting coating film is insufficient in water resistance, alkali resistance and weather resistance owing to the water-soluble substance used to impart water solubility.
- the film formability between particles is insufficient owing to the strong intra-partide cohesive force. Therefore, their use has been substantially restricted to indoor applications.
- conventional aqueous polyurethane resins have been applied in most cases by heat-drying at high temperatures ordinarily using a crosslinking agent, and the elasticty inherent to urethane resins has been expressed only by such application.
- the object of the present invention lies in the development of an aqueous coating composition having all of the elasticity and abrasion resistance possessed by urethane resins and the weather resistance and toughness possessed by acrylic resins.
- an aqueous coating composition comprising, as essential components,
- the invention also provides an aqueous coating composition obtained by polymerising, in the presence of the above aqueous polyurethane resin (A), radical-polymerisable acrylic monomers (C) containing an amido group-containing monomer in an amount of at least 0.5 part by weight per 100 parts by weight of total polymerizable monomers, in such proportions that the weight ratio, in terms of solids content, of the aqueous polyurethane resin (A) and the radical-polymerizable acrylic monomers (C) is 100/5 to 5/100.
- the invention also provides an aqueous coating composition comprising, as essential components,
- the invention also provides an aqueous coating composition obtained by polymerizing in the presence of an aqueous polyurethane resin (A) as defined in the preceding paragraph, radical polymerizable acrylic monomers (C) containing a carbonyl group-containing monomer in an amount of at least 0.5 part by weight per 100 parts by weight of total polymerizable monomers, in such proportions that the weight ratio, in terms of solids content, of the aqueous polyurethane resin (A) and the radical-polymerizable acrylic monomers (C) is 100/5 to 5/100.
- radical polymerizable acrylic monomers (C) containing a carbonyl group-containing monomer in an amount of at least 0.5 part by weight per 100 parts by weight of total polymerizable monomers, in such proportions that the weight ratio, in terms of solids content, of the aqueous polyurethane resin (A) and the radical-polymerizable acrylic monomers (C) is 100/5 to 5/100.
- the aqueous polyurethane resin (A) used in the present invention can be produced, for example, by subjecting a diisocyanate, a glycol and a carboxylic acid group-containing glycol to an urethane-forming reaction to prepare an urethane prepolymer, subjecting the urethane prepolymer to neutralization and chain extension and adding distilled water to the resulting product
- the organic solvent used in the reaction may be removed as necessary by a known method.
- diisocyanate used in the preparation of the urethane prepolymer there are alicydic or aromatic diisocyanates.
- these diisocyanates indude 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, m-phenylene diisocyanate, xylylene diisocyanate, tetramethylene diisocyanate, lysine diisocyanate, 1,4-cyclohexylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 3,3'-dimethyl-4,4'-biphenylene diisocyanate, 3,3'-dimethoxy-4,4'-biphenylene diisocyanate, 3,3'-dichloro4,4'-biphenylene diisocyanate, 1,5-naphthalene diisocyanate, 1,5-te
- glycol used in the preparation of the urethane prepolymer there can be mentioned a low-molecular glycol, a high-molecular glycol, a polyester polyol, a polycarbonate polyol, etc. They can be used alone, or, in the form of a mixture of a low-molecular glycol with a high-molecular glycol or a polyester polyol as well known in the urethane technique.
- the low-molecular glycol there can be mentioned ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-butylene glycol, tetramethylene glycol, hexamethylene glycol, decamethylene glycol, octanediol, tricyclodecanedimethylol, hydrogenated bisphenol A, cydohexanedimethanol, etc. These can be used in admixture of two or more.
- high-molecular glycol examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc.
- the polyester polyol can be any compound obtained by reacting a glycol component and a dicarboxylic acid component and can be easily produced by a known process.
- the polyester polyol can be obtained not only by an esterification reaction but also by an ester exchange reaction. That is, the polyester polyol can be produced also by an ester exchange reaction using a glycol and a lower alkyl ester of a dicarboxylic acid.
- the polyester polyol used in the present invention is obtained by reacting a glycol component and an unsaturated dicarboxylic acid component, the resulting aqueous polyurethane resin forms a stronger functional bond with radical-polymerizable acrylic monomers to give a more desirable aqueous coating composition.
- the unsaturated dicarboxylic acid there can be mentioned, for example, itaconic acid, maleic acid, phthalic acid, etc.
- dicarboxylic acids for example, isophthalic acid, terephthalic acid, succinic acid, adipic acid, malonic acid, sebacic acid, azelaic acid, etc.
- lower alkyl esters of these dicarboxylic acids can be used alone or in combination.
- carboxylic acid group-containing glycol there can be mentioned 2,2-dimethyiolpropionic acid, 2,2-dimethylol-butyric acid, 2,2-dimethyldvaleric acid, etc.
- the reaction between diisocyanate and glycols is preferably effected in an organic solvent which is inert to isocyanato group and has a high affinity to water, such as dioxane, acetone, methyl ethyl ketone, N-methylpyrrolidone, tetrahydrofuran or the like.
- organic solvent which is inert to isocyanato group and has a high affinity to water, such as dioxane, acetone, methyl ethyl ketone, N-methylpyrrolidone, tetrahydrofuran or the like.
- amines such as trimethylamine, triethylamine, tri-n-propylamine, tributylamine, triethanolamine and the like; sodium hydroxide; potassium hydroxide; ammonia; and so forth.
- a hydrazine derivative is required.
- the hydrazine derivative there can be mentioned hydrazine, ethylene-1,2-dihydrazine, propylene-1,3-dihydrazine, butylene-1,4-dihydrazine, etc.
- chain extender for urethane prepolymer there are ordinarily known polyols such as ethylene glycol, propylene glycol and the like; aliphatic, alicydic or aromatic diamines such as ethylenediamine, propylenediamine, hexamethylenediamine, tolylenediamine, xylylenediamine, diphenyldiamine, diaminodiphenylmethane, diaminocydohexylmethane, piperazine, 2-methylpiperazine, isophoronediamine and the like; and so forth. These compounds, however, cannot be used in the present invention because the urethane resin produced therewith does not effectively form a functional bond with an acrylic resin formed by emulsion polymerization of radical polymerizable acylic monomers.
- the aqueous polyurethane resin obtained by the chain extension of urethane prepolymer is required to have a chemical structure -NHNH 2 at the terminal of the polymer molecule, and only when said resin has that chemical structure, the resin can functionally bond with the carbonyl group-containing monomer or the amido group-containing monomer contained in the radical-polymerizable acrylic monomers.
- the acid value of the aqueous polyurethane resin is preferably 10-200 per resin solid content.
- the acid value is less than 10, there tend to appear agglomerates when the urethane prepolymer formed in an organic solvent is made into an aqueous product using a neutralizing agent, a chain extender and distilled water, and the resulting aqueous polyurethane resin may have poor storage stability.
- the acid value is more than 200, a functional bond between aqueous polyurethane resin and acrylic resin is obtained but the resulting aqueous coating composition has no desired properties in durability, water resistance, etc. in some cases.
- the radical-polymerizable acrylic monomers used to obtain an aqueous coating composition of the present invention are required to contain a carbonyl group-containing monomer or an amido group-containing monomer in an amount of at least 0.5 part by weight per 100 parts by weight of total radical-polymerizable acrylic monomers.
- the surfactant, protective colloid and polymerization initiator used in effecting emulsion polymerization can be those known conventionally.
- the carbonyl group-containing monomer refers to a monomer containing aldo group or keto group and does not indude compounds containing only ester bond or carboxyl group
- examples of the carbonyl-group containing monomer there can be mentioned acrolein, diacetone acrylamide, vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone, diacetone acrylate, acetonitrile acrylate, etc.
- amido group-containing monomer there can be mentioned monoolefinically unsaturated carboxylic acid amides, N-alkyl derivatives of monoolefinically unsaturated carboxylic acid amides and N-alkylol derivatives of monoolefinically unsaturated carboxylic acid amides.
- these monomers indude acrylamide, methacrylamide, itaconic acid amide, maleamide, N-methylacrylamide, N-isobutytacrylamide, N-methylmethacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, N-ethoxymethylacrylamide, N-n-butoxymethylacrylamide, N-iso-propoxymethacrylamide, etc.
- carbonyl group-containing or amido group-containing monomers can be used alone or in combination but are required in an amount of at least 0.5 part by weight, preferably 1.0-10.0 parts by weight per 100 parts by weight of total polymerizable monomers.
- amount is less than 0.5 part by weight, there is seen no effect by functional bond between aqueous polyurethane resin and acrylic resin, and the resulting aqueous coating composition shows no striking improvement in properties such as weather resistance, water resistance, alkali resistance, elasticity, abrasion resistance and the like.
- acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate; methacrylic acid esters such as methyl methacrylate, ethyl methacrylate and the like; and so forth.
- esters of maleic acid, fumaric acid and itaconic acid there can be mentioned esters of maleic acid, fumaric acid and itaconic acid; vinyl esters such as vinyl acetate, vinyl propionate, vinyl tertiary carboxylate and the like; esters of aromatic vinyls such as styrene, vinyltoluene and the like; heterocydic vinyl compounds such as vinylpyrrolidone and the like; vinyl chloride, acrylonitrile, vinyl ether, vinyl ketone, vinyl amide and the like; halogenated vinylidene compounds such as vinylidene chloride, vinylidene fluoride and the like; ⁇ -olefins such as ethylene, propylene and the like; and dienes such as butadiene and the like.
- glycidyl compounds such as glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether and the like; silane compounds such as vinyltrichlorosilane, vinyltriethoxysilane, vinyltris( ⁇ -methoxyethoxy)silane, gamma-methacryloxypropyltrimethoxysilane and the like; carboxyl compounds such as acrylic acid, methacrylic acid, maleic acid or its half ester, fumaric acid or its half ester, itaconic acid or its half ester, crotonic acid and the like; hydroxyl compounds such as ⁇ -hydroxyethyl acrylate, ⁇ -hydroxyethyl methacrylate and the like; and amine compounds such as alkylamino acrylates, alkylamino methacrylates and the like.
- the aqueous polyurethane resin can become a place for the reaction of the radical-polymerizable monomers, and the use of surfactant (emulsifier) is not necessarily required.
- the surfactant (emulsifier) may be used in an amount of 0-10 parts by weight per 100 parts by weight of the radical-polymerizable acrylic monomers.
- the surfactant (emulsifier) can be those known conventionally.
- the surfactant can be appropriately selected from, for example, anionic emulsifiers such as sodium dodecylbenzenesulfate, sodium dodecylbenzenesulfonate, salts of alkyl aryl polyether sulfuric acid and the like; nonionic emulsifiers such as polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene-polyoxypropylene block copolymer and the like; and cationic emulsifiers such as cetyltrimethylammonium bromide, laurylpyridinium chloride and the like.
- anionic emulsifiers such as sodium dodecylbenzenesulfate, sodium dodecylbenzenesulfonate, salts of alkyl aryl polyether sulfuric acid and the like
- nonionic emulsifiers such as polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene-
- a water-soluble oligomer as a dispersant in place of the emulsifier or in combination with the emulsifier. It is also effective to use a water-soluble polymer (e.g. polyvinyl alcohol, hydroxyethyl cellulose) in combination with the emulsifier, or to add said polymer to the emulsion after polymerization.
- a water-soluble polymer e.g. polyvinyl alcohol, hydroxyethyl cellulose
- the total amount of the emulsifier, water-soluble oligomer and water-soluble polymer used is preferably 0-10 parts by weight per 100 parts by weight of the radical-polymerizable acrylic monomers. A total amount higher than this is not preferable because the resulting aqueous coating composition gives, in some cases, a coating film of significantly reduced water resistance.
- radical polymerization initiator used in the emulsion polymerization effected to obtain the aqueous coating composition of the present invention there can be used those employed in ordinary emulsion polymerization.
- examples indude potassium persulfate, ammonium persulfate, azobisisobutyronitrile, its hydrochloride, etc.
- organic peroxides such as cumene hydroperoxide, tert-butyl hydroperoxide and the like.
- redox type initiators i.e.
- the concentration in emulsion polymerization is preferably selected so that the final composition has a solid content of 25-65% by weight from the practical standpoint.
- the ethylenically unsaturated monomers and radical polymerization initiator can be added to the reaction system by a known addition method such as addition in one lump sum, continuous dropping, addition in portions or the like.
- the emulsion poymerization is effected at a temperature range employed in known emulsion polymerization, at atmospheric pressure or, when ethylenically unsaturated monomers of gaseous state are used, under pressure.
- radical-polymerizable acrylic monomers containing a carbonyl group-containing monomer or an amido group-containing monomer are emulsion-polymerized in the presence of an aqueous polyurethane resin subjected to chain extension with a hydrazine derivative, whereby a strong functional bond is expressed within each emulsion particlee and between emulsion partides when these particles form a film.
- This bond is thought to appear as a result of an organic reaction which takes place at the time of dehydration and film formation between the hydrazine group at the polymer molecule terminal of the aqueous polyurethane resin and the carbonyl or amido group of the acrylic polymer.
- the aqueous coating composition of the present invention the function of a condensation type resin and the function of a radical polymerization resin are combined organically. Therefore, the aqueous coating composition not only has all of the elasticity and abrasion resistance possessed by urethane resins and the weather resistance and toughness possessed by acrylic resins but also has much higher solvent resistance, etc. than the respective resins do.
- the coating film obtained with an aqueous polyurethane resin dissolves easily in ketones (e.g. methyl ethyl ketone), and the coating film obtained with an acrylic resin emulsion synthesized using no aqueous polyurethane resin dissolves easily in tduene, etc.
- the aqueous coating composition of the present invention is insoluble in any of methyl ethyl ketone and toluene.
- the aqueous coating composition of the present invention has a heat-softening temperature higher than those of the aqueous polyurethane resin and the aqueous dispersion of an acrylic copolymer both contained in the aqueous coating composition. Said heat-softening temperature cannot be attained by mere mixing of said aqueous resin and said aqueous dispersion.
- the compounding ratio of the aqueous polyurethane resin and the aqueous dispersion of an acrylic copolymer is required to be 100/5 to 5/100, preferably 100/10 to 10/100 in terms of solid content weight ratio.
- the ratio deviates from this range, the resulting aqueous coating composition is difficult to have both the properties of the aqueous polyurethane resin and the properties of the aqueous dispersion of an acrylic copolymer, and accordingly it is hard to obtain a coating film having features as mentioned previously.
- the compounding ratio of the aqueous polyurethane resin and the aqueous dispersion of an acrylic copolymer is appropriately selected within the above range so as to give an aqueous coating composition of desired properties. By doing so, the properties of urethane resin or acrylic resin can be emphasized in the aqueous coating composition.
- the compounding ratio of the aqueous polyurethane resin (A) and the radical-polymerizable acrylic monomers (C) is requird in the present invention to be 100/5 to 5/100, preferably 100/10 to 10/100 in terms of solid content weight ratio.
- the ratio deviates from the above range, the resulting aqueous coating composition is difficult to have both the properties of polyurethane resin and the properties of acrylic resin, and accordingly it is hard to obtain a coating film having features as mentioned previously.
- the compounding ratio of the aqueous polyurethane resin and the radical-polymerizable acrylic monomers within the above range, the properties of urethane resin or acrylic resin can be emphasized in the aqueous coating composition.
- the aqueous coating composition of the present invention can be produced in the same manner as in the production of an aqueous coating composition using, as a vehide, a conventional type aqueous dispersion of an acrylic copolymer, by using, as a vehicle, a composition comprising an aqueous polyurethane (A) and an aqueous dispersion (B) of an acrylic copolymer or a composition which is an aqueous polyurethane resin-acrylic resin composite, obtained by polymerizing radical-polymerizable acrylic monomers (C) in the presence of an aqueous polyurethane resin (A).
- a composition comprising an aqueous polyurethane (A) and an aqueous dispersion (B) of an acrylic copolymer or a composition which is an aqueous polyurethane resin-acrylic resin composite, obtained by polymerizing radical-polymerizable acrylic monomers (C) in the presence of an aqueous polyurethane resin (A
- said composition is combined with a pigment, a filler, an aggregate, a dispersant, a wetting agent, a thickener and/or a rheology-controlling agent, a defoamant, a plasticizer, a film formation aid, an organic solvent, an antiseptic, a fungicide, a pH-controlling agent, a rust preventive, etc. so as to meet an application purpose, and a coating is obtained according to an ordinary method.
- 1,780 g of 1,6-hexanediol, 2,545 g of adipic acid and 567 g of 2,2-dimethylolpropionic acid were mixed, heated to 170°C, and reacted for 23 hours at that temperature to obtain a polyester polyol having a hydroxyl value of 60 and an acid value of 60.
- the polyester polyol was diluted with 1,815 g of methyl ethyl ketone.
- To 240 g of the resulting polyester polyol solution (I) were added 220 g of methyl ethyl ketone, 30 g of 2,2-dimethyldpropionic acid and 27 g of cyclohexanedimethanol, and they were stirred.
- To the mixture was added 236 g of 4,4'-dicydohexylmethane diisocyanate. They were heated to 80°C, reacted for 6 hours, and cooled to 30°C to obtain an urethane prepolymer solution.
- the urethane prepolymer was slowly poured into an aqueous amine solution obtained by dissolving 21 g of an 80% aqueous hydrazine solution and 40 g of triethylamine in 1,500 g of deionized water, with stirring at a high speed, to obtain a viscous translucent product.
- the product was heated at 55°C under reduced pressure to remove the solvent.
- deionized water was added deionized water to effect concentration adjustment to obtain a translucent aqueous polyurethane resin (A-1) having a non-volatile content of 23.7%, a viscosity (BM viscometer, 60 rpm, 25°C) of 23 cps and a pH of 8.4.
- An aqueous polyurethane resin (A-2 to A-4) having the properties shown in Table 1 was prepared in the same manner as above, using the materials shown in Table 1.
- the follosing materials werer prepared. Polymerizable monomers 2-Ethylhexyl acrylate 265 g Styrene 165 g Acrylonitrile 50 g Acrylic acid 10 g Diacetone acrylamide 10 g Surfactant Newcol 707SF (special anionic emulsifier manufactured by Nihon Nyukazai, solid content: 30%) 50 g Deionized water 360 g Polymerization initiator Ammonium persulfate 2.5 g
- the reaction mixture was cooled and adjusted to pH 8-9 with 14% ammonia water to obtain an aqueous dispersion of an acrylic copolymer, having a non-volatile content of 55.1 %, a viscosity of 3.000 cPs and pH 8.5.
- Aqueous dispersions (B-2) to (B-4) of acrylic copolymers having the properties shown in Table 2 were prepared in the same manner as above, using the materials shown in Table 2.
- aqueous polyuretane resins (A-1) and (A-4) obtained in Production Example 1 and the aqueous dispersions (B-1) to (B-4) of acrylic copolymers obtained in Production Example 2 were compounded as in Table 3-1 to prepare aqueous coating compositions of Examples 1-6 and Comparative Examples 1-9.
- the follosing materials were prepared. Radical-polymerizable monomers 2-Ethylhexyl acrylate 265 g Styrene 165 g Acrylonitrile 50 g Acrylic Acid 10 g Diacetone acrylamide 10 g Surfactant Newcol 707SF (special anionic emulsifier manufactured by Nihon Nyukazai, solid content: 30%) 50 g Deionized water 360 g Polymerization initiator Ammonium persulfate 2.5 g
- Example 7 After the completion of the dropping, the reaction was continued for a further 2 hours with stirring while maintaining the same temperature. The reaction mixture was cooled and adjusted to pH 8-9 with a 14 % ammonia water to obtain an aqueous coating composition of Example 7 having a non-volatile content of 38.0 %, a viscosity of 200 cPs and pH 8.5.
- Aqueous coating compositions of Examples 8-11 and Comparative Examples 10-14 were obtained in the same manner as in Example 7, using the materials shown in Table 3-2.
- Emulsion polymerization was conducted in the same manner as in Example 7 except that the aueous polyurethane resin (A-1) was not used, to obtain an acrylic copolymer emulsion.
- the emulsion had a non-volatile content of 55.1 %, a viscosity of 3.300 cPs and pH 8.5
- the aqueous polyurethane resin (A-1) per se was used in this Comparative Example to examine the effect of its combination use with an acrylic polymer.
- a sample was coated on a glass plate by a 3-mil applicator and dried for 3 days at room temperature.
- the resulting coating film was immersed in water for 7 days at room temperature and then the film condition was examined visually. ( ⁇ indicates a good film condition; ⁇ indicates a normal film condition; and X indicates a poor film condition. These rating criteria also apply hereinafter.)
- the coating film prepared in the same manner as in (1) above was immersed in a 2% aqueous NaOH solution for 7 days and then the film condition was examined visually.
- the coating film prepared in the same manner as in (1) above was immersed in methyl ethyl ketone for 1 day and then the film condition was examined visually.
- a sample was coated on a standard tile (a vinyl-asbestos tile) for testing according to the JFPA specification, in an amount of 10 ⁇ 2 ml per m 2 of said tile. Coating was effected 5 times in the same manner. The resulting test piece was dried for 7 days at normal temperature and tested for extent of abrasion using a Taber machine (abrasion ring: CS-17, load: 1,000 g).
- a sample was coated on a glass plate so that the resulting film had a thickness of 0.2 mm after drying, and then dried for 7 days.
- a sample was coated on a glass plate and dried for 7 days. 1.5-2.0 g of the resulting coating film was used and measured for flow-starting temperature (by using Koka flow Tester) under conditions of a temperature elevation speed of 3°C/min, a load of 30 kgf and a die of 1 mm ⁇ x 1 mml.
- the aqueous coating compositions as compared with other compositions not meeting the requirements of the present invention, are very superior in abrasion resistance, solvent resistance and stress and strain of coating film. Further, they have a far higher flow-starting temperature. Therefore, it is understood that the aqueous coating compositions of the present invention have a functional bond between aqueous urethane resin and acrylic resin.
- a coating was measured for viscosity (cPs) by a BH type viscometer (4 rpm).
- a coating was coated on a glass plate by a 3-mil applicator and dried for 1 day.
- the resulting film was measured for reflectance (%) of 60°/60°.
- a sample was prepared so that the coating film had a thickness of about 1 mm when dried. It was aged according to the JIS method for strain and subjected to punching by No. 2 dumbbell. The resulting piece was used as a test piece. (Coating ⁇ aging for 7 days ⁇ back side aging for 7 days ⁇ punching)
- the above sample piece was subjected to punching by No. 1 dumbbell.
- the resulting piece was used as a test piece.
- Acrydic 53-448 was coated as a primer and dried for 3 hours. Then, a sample was coated thereon according to the test method and aged for 14 days. The resulting material was used for testing. Incidentally, the test material used for adhesion strength after immersion in water had been coated at the four sides with a vinyl chloride resin coating, 3 days befoe the completion of the aging.
- the adhesive used was a two-pack type epoxy adhesive.
- the same coating film as used in the measurement of strain was subjected to light exposure for 50 hours in a standard weatherometer and then measured for strain at 20°C and -10°C.
- the aqueous coating compositions of the present invention also when compounded with a pigment, have good weather resistance and the strengths of the resulting coating films do not deteriorate even after immersion in water.
- aqueous coating compositions of Examples 1-6 and Comparative Examples 1-9 were made into films by themselves using no additive, and the films were measured for properties. The results are shown in Table 6-1.
- the aqueous coating compositions of the present invention even when no pigment is compounded, have good weather resistance, and the strengths of the resulting coating films do not deteriorate even after immersion in water.
- the aueous coating compositions of the present invention also when compounded with a pigment, have good weather resistance and the strengths of the resulting coating films do not deteriorate even after immersion in water.
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Claims (9)
- Composition aqueuse de revêtement, comprenant, en tant que composants essentiels,une résine aqueuse de polyuréthanne (A) qui ne contient pas de groupes hydrazino latéraux et que l'on peut obtenir en faisant réagir un diisocyanate et des glycols comprenant un glycol comportant un groupe acide carboxylique, pour obtenir un prépolymère d'uréthanne, en neutralisant ce prépolymère et en soumettant le prépolymère d'uréthanne neutralisé à un allongement de chaîne avec un dérivé de l'hydrazine, etune dispersion aqueuse (B) d'un copolymère acrylique dont les monomères constitutifs comprennent un monomère comportant un groupe amide, en une quantité d'au moins 0,5 partie en poids pour 100 parties en poids du total des monomères polymérisables,et dans laquelle le rapport pondéral, en termes de teneur en matières solides, de la résine aqueuse de polyuréthanne (A) et de la dispersion aqueuse (B) de copolymère acrylique vaut de 100/5 à 5/100.
- Composition aqueuse de revêtement, obtenue par polymérisation, en présence d'une résine aqueuse de polyuréthanne (A) telle que définie dans la revendication 1, de monomères acryliques (C) polymérisables par voie radicalaire, comprenant un monomère comportant un groupe amide, en une quantité d'au moins 0,5 partie en poids pour 100 parties en poids du total des monomères polymérisables, en des proportions telles que le rapport pondéral, en termes de teneur en matières solides, de la résine aqueuse de polyuréthanne (A) et des monomères acryliques (C) polymérisables par voie radicalaire vaut de 100/5 à 5/100.
- Composition aqueuse de revêtement conforme à la revendication 1 ou 2, dans laquelle le monomère contenant un groupe amide est au moins l'un des suivants : acrylamide, méthacrylamide, monoamide de l'acide itaconique, diamide de l'acide itaconique, monoamide de l'acide maléique, diamide de l'acide maléique, N-méthyl-acrylamide, N-isobutyl-acrylamide, N-méthyl-méthacrylamide, N-méthylol-acrylamide, N-éthoxyméthyl-acrylamide, N-n-butoxyméthyl-acrylamide et N-isopropoxyméthyl-acrylamide.
- Composition aqueuse de revêtement, comprenant, en tant que composants essentiels,une résine aqueuse de polyuréthanne (A) qui ne contient pas de groupes carbonyle latéraux ou de groupes hydrazino latéraux et que l'on peut obtenir en faisant réagir un diisocyanate et des glycols comprenant un glycol comportant un groupe acide carboxylique, pour obtenir un prépolymère d'uréthanne, en neutralisant ce prépolymère et en soumettant le prépolymère d'uréthanne neutralisé à un allongement de chaîne avec un dérivé de l'hydrazine, etune dispersion aqueuse (B) d'un copolymère acrylique dont les monomères constitutifs comprennent un monomère comportant un groupe carbonyle, en une quantité d'au moins 0,5 partie en poids pour 100 parties en poids du total des monomères polymérisables, et dans laquelle le rapport pondéral, en termes de teneur en matières solides, de la résine aqueuse de polyuréthanne (A) et de la dispersion aqueuse (B) de copolymère acrylique vaut de 100/5 à 5/100.
- Composition aqueuse de revêtement, obtenue par polymérisation, en présence d'une résine aqueuse de polyuréthanne (A) telle que définie dans la revendication 4, de monomères acryliques (C) polymérisables par voie radicalaire, comprenant un monomère comportant un groupe carbonyle, en une quantité d'au moins 0,5 partie en poids pour 100 parties en poids du total des monomères polymérisables, en des proportions telles que le rapport pondéral, en termes de teneur en matières solides, de la résine aqueuse de polyuréthanne (A) et des monomères acryliques (C) polymérisables par voie radicalaire vaut de 100/5 à 5/100.
- Composition aqueuse de revêtement conforme à la revendication 4 ou 5, dans laquelle le monomère contenant un groupe carbonyle est au moins l'un des suivants : acroléine, diacétone-acrylamide, vinyl-méthyl-cétone, vinyl-éthyl-cétone, vinyl-butyl-cétone, diacétoneacrylate et acétonitrile-acrylate.
- Composition aqueuse de revêtement, conforme à l'une quelconque des revendications précédentes, dans laquelle la résine aqueuse de polyuréthanne (A) peut être obtenue par réaction d'un diisocyanate et de glycols comprenant, en tant que composants essentiels, un polyester-polyol et un glycol comportant un groupe acide carboxylique.
- Composition aqueuse de revêtement, conforme à l'une quelconque des revendications précédentes, dans laquelle le dérivé d'hydrazine est au moins l'un des suivants : hydrazine, éthylène-1,2-dihydrazine, propylène-1,3-dihydrazine et butylène-1,4-dihydrazine.
- Utilisation d'une composition aqueuse de revêtement, conforme à l'une quelconque des revendications précédentes, dans la préparation de films de revêtement.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP130179/88 | 1988-05-30 | ||
JP130178/88 | 1988-05-30 | ||
JP63130178A JP2684678B2 (ja) | 1988-05-30 | 1988-05-30 | 水性被覆剤組成物 |
JP63130179A JP2684679B2 (ja) | 1988-05-30 | 1988-05-30 | 水性被覆剤組成物の製造方法 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0350157A2 EP0350157A2 (fr) | 1990-01-10 |
EP0350157A3 EP0350157A3 (fr) | 1991-07-03 |
EP0350157B1 EP0350157B1 (fr) | 1993-01-20 |
EP0350157B2 true EP0350157B2 (fr) | 1997-12-17 |
Family
ID=26465373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89305419A Expired - Lifetime EP0350157B2 (fr) | 1988-05-30 | 1989-05-30 | Composition de revêtement aqueuse |
Country Status (3)
Country | Link |
---|---|
US (1) | US5141983A (fr) |
EP (1) | EP0350157B2 (fr) |
DE (1) | DE68904485T3 (fr) |
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-
1989
- 1989-05-30 DE DE68904485T patent/DE68904485T3/de not_active Expired - Fee Related
- 1989-05-30 EP EP89305419A patent/EP0350157B2/fr not_active Expired - Lifetime
-
1991
- 1991-12-17 US US07/808,977 patent/US5141983A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0350157A3 (fr) | 1991-07-03 |
EP0350157B1 (fr) | 1993-01-20 |
DE68904485T3 (de) | 1998-05-20 |
US5141983A (en) | 1992-08-25 |
DE68904485T2 (de) | 1993-08-19 |
EP0350157A2 (fr) | 1990-01-10 |
DE68904485D1 (de) | 1993-03-04 |
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